.head_a {
  height: 44px;
  line-height: 44px;
  text-align: center;
  font-size: 18px;
  color: #3838389a;
  background-color: rgba(255, 255, 255, 0.8);
}
.main {
  flex: 1;
  /* background: color image repeat position / size; */
  /* background-size: cover; */
  position: relative;
  height: 100%;
}
.main video {
  width: 100%;
  height: 100%;
  position: fixed;
  top: 0;
  z-index: -1;
  object-fit: cover;
}
.main .text {
  /* 大写 */
  text-transform: uppercase;
  color: #fff;
  font-size: 48px;
  font-weight: bold;
  width: 100%;
  text-align: center;
  position: absolute;
  bottom: 100px;
  /* opacity: 0; */
  /* animation: move 2s both; */
}
.main .jump {
  width: 105px;
  height: 40px;
  text-align: center;
  line-height: 40px;
  background-color: #fff;
  border-radius: 20px;
  position: absolute;
  right: 20px;
  top: 20px;
  opacity: 0.5;
}
.main .jump a {
  color: #000;
}
/* @keyframes move {
  0%{
      transform: translateY(-100px);
      font-size: 0px;
  }

  20%{
      transform: translateY(-120px);
      opacity: .2;
      font-size: 10px;
  }

  50%{
      transform: translateY(20px);
      opacity: .8;
      font-size: 36px;
  }

  100%{
      transform: translateY(0);
      opacity: 1;
      font-size: 48px;
  }
} */
